Simply take the ring gear to a reputable machine shop, have them make a 1/4 inch ring gear spacer. The ring gear bolts are oddball, left hand thread...strange size. You will need to find bolts that are 1/4in longer of course, I used some that were for a early to mid 60's olds rear. Mine has held up very well. Check the sig. If there are any questions, let me know.

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Black 89 IROC...355, Solid Crower Cam, TFS heads.
12.0 @ 120.3mph with a 1.9 60ft...all motor

 

interesting. how much did it cost you to get the spacer made? also, do you remember the size of the bolts, cause i just might do this and wanna find the bolts asap since my rear is going out right now.

 

I do not remember the size of the bolts, you would have to pull one out and go from there. It cost me about $60 to have the spacer made.

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Black 89 IROC...355, Solid Crower Cam, TFS heads.
12.0 @ 120.3mph with a 1.9 60ft...all motor